"Don't delay" letters (4)

I believe the answer is:

asap

(Other definitions for asap that I've seen before include "Notation meaning with minimum delay" , "Notation-acronym meaning without delay" , "'As quickly as you can, initially (4)'" , "Common acronym for quick-as-you-can" , "Initials notation meaning with all possible speed" .)

I've seen this clue in the LA Times.

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